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Fast spectrally encoded Mueller optical scanning microscopy.

Sylvain Rivet1, Matthieu Dubreuil2, Adrian Bradu3

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A novel Mueller scanning microscope uses spectral encoding for rapid, real-time imaging of sample polarization properties. This advancement enables simultaneous display of all polarimetric parameters at 1.5 Hz, aiding live microscope adjustment.

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Area of Science:

  • Optical microscopy
  • Biophysics
  • Materials science

Background:

  • Mueller microscopy visualizes optical anisotropy in samples at the sub-micrometer scale.
  • Fast polarimetric parameter acquisition is crucial for real-time imaging and microscope adjustment.

Purpose of the Study:

  • To present a full Mueller scanning microscope utilizing spectral encoding of polarization.
  • To achieve rapid imaging rates for real-time visualization of polarimetric parameters.

Main Methods:

  • A Mueller scanning microscope employing spectral encoding of polarization was developed.
  • The system collects spectral data every 10 μs per pixel to reconstruct the full Mueller matrix.
  • Real-time display of linear birefringent images guides the operator.

Main Results:

  • The microscope achieves an imaging rate of 1.5 Hz for 256x256 pixel images, displaying all polarimetric parameters simultaneously.
  • The instrument allows seamless switching between Mueller and Second Harmonic Generation (SHG) microscopy with pixel-to-pixel matching.
  • Performance was demonstrated by imaging unstained biological specimens.

Conclusions:

  • The developed Mueller microscope enables unprecedented real-time imaging of polarization properties.
  • Its dual-modality capability (Mueller and SHG) offers versatile bio-imaging solutions.
  • This technology facilitates advanced studies of unstained biological samples.